Hornbeck is making a comparison to how the days when Colonel Brady was in charge things were in order, but now that hes gone things have gotten out of hand; that things have fallen apart.
He tries to make his explanation by saying "But they've got inside plumbing in their heads these days." When he says this he means that they have their minds stuck on something, but what they need to really focus on.
He tries to make his explanation by saying "But they've got inside plumbing in their heads these days." When he says this he means that they have their minds stuck on something, but what they need to really focus on.